Attribute Name,Reference
comment,[RFC4819]
comment-language,[RFC4819]
command-override,[RFC4819]
subsystem,[RFC4819]
x11,[RFC4819]
shell,[RFC4819]
exec,[RFC4819]
agent,[RFC4819]
env,[RFC4819]
from,[RFC4819]
port-forward,[RFC4819]
reverse-forward,[RFC4819]